Fig. 1: Detection of BMP4 receptors in rat testis and progenitor Leydig cells (PLCs).

A–F Immunohistochemistry of BMPR1A, BMPR1B, and BMPR2 in cross-sections of 21-day-old rat testis (black arrow: BMPR1A+; asterisks: BMPR1B+, black arrowhead: BMPR2+. G, H Negative control (#: Leydig cells). Scale bar = 100 μm. I–L Immunofluorescence of BMPR1A, BMPR1B and BMPRII in PLCs. H Negative control. Scale bar = 20 μm.